COMMUNICATION MODBUS PROTOCOL

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1 COMMUNICATION MODBUS PROTOCOL MFD4E06 - NEMO-D4e PR146 08/03/2018 Pag. 1/16 CONTENTS 1.0 ABSTRACT DATA MESSAGE DESCRIPTION Parameter description Data format Description of CRC calculation Error management Timing COMMANDS VARIABLES SETUP PARAMETERS... 12

2 COMMUNICATION MODBUS PROTOCOL Pag. 2/ ABSTRACT Physical level The physical communication line complies with the EIA-RS485 standard in half-duplex modality. In this case, as only two wires are used, only one instrument at a time can engage the line; this means that there must be a master which polls the slave instruments so the demand and the request are alternated. On the same physical line only 32 instruments can be attached (master included). In order to increase the number of the slave instrument, the necessary repeaters must be used. The communication parameters are : Baud rate : programmable (device dependant) bit n. : 8 stop bit : 1 parity : programmable (device dependant) Data link level The data are transmitted in a packet form (message) and are checked by a word (CRC). See the description of the data packet in the next paragraphs for more details. Application level The communication protocol used is MODBUS/JBUS compatible. Up to 255 different instruments can be managed by the protocol. There are no limitations to the number of possible retries done by the master. A delay between the response from the slave and the next command could be necessary and it is specified for each device (timing).

3 COMMUNICATION MODBUS PROTOCOL Pag. 3/ DATA MESSAGE DESCRIPTION The generic data message is composed as following : Device address Functional code Data CRC word Two answers are possible : Answer containing data Device address Functional code Data CRC word Error answer Device address Functional code + 0x80 Error code CRC word 2.1 Parameter description Device address : device identification number in the network. It must be the same for the demand and the answer. Format : 1 BYTE from 0 to 0xff 0 is for broadcast messages with no answer Functional code : command code Used functional code : Format : 1 BYTE 0x03 : reading of consecutive words 0x10 : writing of consecutive words Data : CRC word : they can be - the address of the required words (in the demand) - the data (in the answer) it is the result of the calculation done on all the bytes in the message

4 COMMUNICATION MODBUS PROTOCOL Pag. 4/ Data format The following types of format are used for the data values : * U_WORD : one WORD - unsigned Example : 1000 = 0x 03 e8 MSB 0x03 LSB 0xe8 2.3 Description of CRC calculation The following is an example of the CRC calculation in C language. unsigned int calc_crc (char *ptbuf, unsigned int num) /* **************************************************************** * Descrizione : calculates a data buffer CRC WORD * Input : ptbuf = pointer to the first byte of the buffer * num = number of bytes * Output : // * Return : ** ***************************************************************/ { unsigned int crc16; unsigned int temp; unsigned char c, flag; crc16 = 0xffff; /* init the CRC WORD */ for (num; num>0; num--) { temp = (unsigned int) *ptbuf; /* temp has the first byte */ temp &= 0x00ff; /* mask the MSB */ crc16 = crc16 ^ temp; /* crc16 XOR with temp */ for (c=0; c<8; c++) { flag = crc16 & 0x01; /* LSBit di crc16 is mantained */ crc16 = crc16 >> 1; /* Lsbit di crc16 is lost */ if (flag!= 0) crc16 = crc16 ^ 0x0a001; /* crc16 XOR with 0x0a001 */ } ptbuf++; /* pointer to the next byte */ } crc16 = (crc16 >> 8) (crc16 << 8); /* LSB is exchanged with MSB */ return (crc16); } /* calc_crc */

5 COMMUNICATION MODBUS PROTOCOL Pag. 5/ Error management If the received message is incorrect (CRC16 is wrong) the polled slave doesn t answer. If the message is correct but there are errors (wrong functional code or data) it can t be accepted, so the slave answers with an error message. The error codes are defined in the following part of the document. 2.5 Timing Be careful : among the setup parameters there is a timeout value that may be programmed. This is the inter-characters timeout and implicitly is the timeout to detect the end of a message. The value of 20 msec is suggested to keep compatibility with older IME devices. The minimum value is 3 msec. TIME DESCRIPTION Min & Max VALUES T1 Time between characters. If this time exceeds the programmed timeout, the message is considered closed by the device Min = 3 msec Max <= 99 msec T2 Slave response time Minimum and maximum response time of device to the Max = 20 ms. Master request after a message has been detected valid T3 Time before a new message request from the Master Min = 1 msec

6 COMMUNICATION MODBUS PROTOCOL Pag. 6/ COMMANDS Code 0x03 : reading of one or more consecutive WORDS Command format : BYTE BYTE MSB LSB MSB LSB Device address Funct. Code First WORD address WORDS number CRC16 Answer format (containing data) : BYTE BYTE BYTE MSB LSB MSB LSB Device address Funct. Code BYTES number WORD 1... WORD N. CRC16 The BYTES number must always match the WORDS number (in the demand) * 2. Answer format (the demand was wrong) : BYTE BYTE BYTE Device address Funct. Code + 0x80 Error code CRC16 Error codes : * 0x01 : incorrect functional code * 0x02 : wrong first WORD address * 0x03 : incorrect data Code 0x10 : writing of more consecutive WORDS Command format : BYTE BYTE MSB LSB Device address Funct. Code First WORD address MSB LSB WORDS number BYTE MSB LSB MSB LSB BYTE numbers Word Value CRC16 Answer format (containing data) : BYTE BYTE MSB LSB MSB LSB Funct. Device address First WORD address WORDS number CRC16 Code The BYTES number must always match the WORDS number (in the demand) * 2. Answer format (the demand was wrong) : BYTE BYTE BYTE Device address Funct. Code + 0x80 Error code CRC16 Error codes : * 0x01 : incorrect functional code * 0x02 : wrong first WORD address * 0x03 : incorrect data

7 COMMUNICATION MODBUS PROTOCOL Pag. 7/ VARIABLES Variables or groups of variables may be required up to 240 BYTES 0x100 U_WORD Current transformer ratio (KTA) No unit 0x102 U_WORD Voltage transformer ratio (KTV) 1/100 (hundredths) 0x103 U_WORD Future development --- 0x300 U_WORD Device identifier 0x1013

8 COMMUNICATION MODBUS PROTOCOL Pag. 8/16 Address Format Description Unit 0x1000 UD_WORD Phase 1 : phase voltage mv 0x1002 UD_WORD Phase 2 : phase voltage mv 0x1004 UD_WORD Phase 3 : phase voltage mv 0x1006 UD_WORD Phase 1 : current ma 0x1008 UD_WORD Phase 2 : current ma 0x100a UD_WORD Phase 3 : current ma 0x100c UD_WORD Neutral current ma 0x100e UD_WORD Chained voltage : L1-L2 mv 0x1010 UD_WORD Chained voltage : L2-L3 mv 0x1012 UD_WORD Chained voltage : L3-L1 mv 0x1014 UD_WORD 3-phase : active power (2) 0x1016 UD_WORD 3-phase : reactive power (2) 0x1018 UD_WORD 3-phase : apparent power (2) 0x101a U_WORD 3-phase : sign of active power (4) 0x101b U_WORD 3-phase : sign of reactive power (4) 0x101c UD_WORD 3-phase : positive active energy (3) 0x101e UD_WORD 3-phase : positive reactive energy (3) 0x1020 UD_WORD 3-phase : negative active energy (3) 0x1022 UD_WORD 3-phase : negative reactive energy (3) 0x1024 S_WORD 3-phase : power factor 1/100 signed 0x1025 U_WORD 3-phase : sector of power factor (cap or ind) 0 : PF = 1 1 : ind 2 : cap 0x1026 U_WORD Frequency Hz/10 0x1027 UD_WORD 3-phase : average power (2) 0x1029 UD_WORD 3-phase : peak maximum demand (2) 0x102b U_WORD Time counter for average power minutes 0x102c UD_WORD Phase 1 : active power (2) 0x102e UD_WORD Phase 2 : active power (2) 0x1030 UD_WORD Phase 3 : active power (2) 0x1032 U_WORD Phase 1 : sign of active power (4) 0x1033 U_WORD Phase 2 : sign of active power (4) 0x1034 U_WORD Phase 3 : sign of active power (4) 0x1035 UD_WORD Phase 1 : reactive power (2) 0x1037 UD_WORD Phase 2 : reactive power (2) 0x1039 UD_WORD Phase 3 : reactive power (2) 0x103b U_WORD Phase 1 : sign of reactive power (4) 0x103c U_WORD Phase 2 : sign of reactive power (4) 0x103d U_WORD Phase 3 : sign of reactive power (4) 0x103e UD_WORD Phase 1 : apparent power (2) 0x1040 UD_WORD Phase 2 : apparent power (2) 0x1042 UD_WORD Phase 3 : apparent power (2) 0x1044 S_WORD Phase 1 : power factor 1/100 signed 0x1045 S_WORD Phase 2 : power factor 1/100 signed 0x1046 S_WORD Phase 3 : power factor 1/100 signed 0x1047 U_WORD Phase 1 : power factor sector 0 : PF = 1 1 : ind 2 : cap 0x1048 U_WORD Phase 2 : power factor sector 0 : PF = 1 1 : ind 2 : cap 0x1049 U_WORD Phase 3 : power factor sector 0 : PF = 1 1 : ind 2 : cap 0x104a U_WORD Phase 1 : THD V1 % ( ) 0x104b U_WORD Phase 2 : THD V2 % ( )

9 COMMUNICATION MODBUS PROTOCOL Pag. 9/16 0x104c U_WORD Phase 3 : THD V3 % ( ) 0x104d U_WORD Phase 1 : THD I1 % ( ) 0x104e U_WORD Phase 2 : THD I2 % ( ) 0x104f U_WORD Phase 3 : THD I3 % ( ) 0x1050 UD_WORD Phase 1 : I1 average ma 0x1052 UD_WORD Phase 2 : I2 average ma 0x1054 UD_WORD Phase 3 : I3 average ma 0x1056 UD_WORD Phase 1 : I1 peak maximum ma 0x1058 UD_WORD Phase 2 : I2 peak maximum ma 0x105a UD_WORD Phase 3 : I3 peak maximum ma 0x105c UD_WORD (I1+I2+I3)/3 ma 0x105e UD_WORD Phase 1 : V1 min mv 0x1060 UD_WORD Phase 2 : V2 min mv 0x1062 UD_WORD Phase 3 : V3 min mv 0x1064 UD_WORD Phase 1 : V1 max mv 0x1066 UD_WORD Phase 2 : V2 max mv 0x1068 UD_WORD Phase 3 : V3 max mv 0x106a UD_WORD 3-phase : active partial energy (3) 0x106c UD_WORD 3-phase : reactive partial energy (3) 0x106e U_WORD Run hour meter Hour 0x106f U_WORD RFU (1) 0x1070 UD_WORD 3-phase : active average power (2) 0x1072 UD_WORD 3-phase : reactive average power (2) 0x1074 UD_WORD 3-phase : apparent average power (2) 0x1076 UD_WORD 3-phase : active PMD power (2) 0x1078 UD_WORD 3-phase : reactive PMD power (2) 0x107a UD_WORD 3-phase : apparent PMD power (2) 0x107c UD_WORD Run hour meter minutes 0x107e UD_WORD Distorting power (2) 0x1200 U_WORD Current transformer ratio (KTA) No unit 0x1201 U_WORD Voltage transformer ratio (KTV) 1/100 (hundredths) 0x1202 UD_WORD Future developments --- 0x1204 U_WORD Device identifier 0x1013 0x1205 U_WORD Future developments --- 0x1206 U_WORD Future developments --- 0x1500 UD_WORD Positive Active Energy - Low Wh 0x1502 UD_WORD Positive Active Energy High MWh 0x1504 UD_WORD Positive Reactive Energy - Low varh 0x1506 UD_WORD Positive Reactive Energy High Mvarh 0x1508 UD_WORD Negative Active Energy - Low Wh 0x150A UD_WORD Negative Active Energy High MWh 0x150C UD_WORD Negative Reactive Energy - Low varh 0x150E UD_WORD Negative Reactive Energy High Mvarh 0x1510 UD_WORD RFU 0x1512 UD_WORD RFU 0x1514 UD_WORD RFU 0x1516 UD_WORD RFU 0x1518 SD_WORD Signed 3-ph Active Power W 0x151A SD_WORD Signed 3-ph Reactive Power var 0x151C SD_WORD Signed Phase1 Active Power W 0x151E SD_WORD Signed Phase2 Active Power W 0x1520 SD_WORD Signed Phase3 Active Power W

10 COMMUNICATION MODBUS PROTOCOL Pag. 10/16 0x1522 SD_WORD Signed Phase1 Reactive Power var 0x1524 SD_WORD Signed Phase2 Reactive Power var 0x1526 SD_WORD Signed Phase3 Reactive Power var 0x1528 SD_WORD Signed 3-ph Power Factor 1/1000 0x152A SD_WORD Signed Phase1 Power Factor 1/1000 0x152C SD_WORD Signed Phase2 Power Factor 1/1000 0x152E SD_WORD Signed Phase3 Power Factor 1/1000 0x1530 UD_WORD Apparent power W 0x1532 UD_WORD 3-phase : active average power W 0x1534 UD_WORD 3-phase : reactive average power var 0x1536 UD_WORD 3-phase : apparent average power VA 0x1538 UD_WORD 3-phase : active PMD power W 0x153a UD_WORD 3-phase : reactive PMD power var 0x153c UD_WORD 3-phase : apparent PMD power VA 0x1540 U_WORD Wrap round positive active energy (5) 0x1541 U_WORD Wrap round positive reactive energy (5) 0x1542 U_WORD Wrap round negative active energy (5) 0x1543 U_WORD Wrap round negative reactive energy (5) 0x1700 UD_WORD Positive Active Energy - Low Wh 0x1702 UD_WORD Positive Active Energy High MWh 0x1704 UD_WORD Positive Reactive Energy - Low varh 0x1706 UD_WORD Positive Reactive Energy High Mvarh 0x1708 UD_WORD Negative Active Energy - Low Wh 0x170A UD_WORD Negative Active Energy High MWh 0x170C UD_WORD Negative Reactive Energy - Low varh 0x170E UD_WORD Negative Reactive Energy High Mvarh 0x1710 UD_WORD Partial+ Active Energy - Low Wh 0x1712 UD_WORD Partial+ Active Energy - High MWh 0x1714 UD_WORD Partial+ Reactive Energy - Low varh 0x1716 UD_WORD Partial+ Reactive Energy - High Mvarh 0x1718 UD_WORD Partial- Active Energy - Low Wh 0x171a UD_WORD Partial- Active Energy - High MWh 0x171c UD_WORD Partial- Reactive Energy Low varh 0x171e UD_WORD Partial- Reactive Energy - High Mvarh 0x1720 SD_WORD Signed 3-ph active power W 0x1722 SD_WORD Signed 3-ph reactive power var 0x1724 SD_WORD Signed phase1 active power W 0x1726 SD_WORD Signed phase2 active power W 0x1728 SD_WORD Signed phase3 active power W 0x172A SD_WORD Signed phase1 reactive power var 0x172C SD_WORD Signed phase2 reactive power var 0x172E SD_WORD Signed phase3 reactive power var 0x1730 SD_WORD Signed 3-ph Power Factor 1/100 0x1732 SD_WORD Signed phase1 Power Factor 1/100 0x1734 SD_WORD Signed phase2 Power Factor 1/100 0x7500 U_WORD THD I1 1/10 % 0x7501 U_WORD THD I2 1/10 %

11 COMMUNICATION MODBUS PROTOCOL Pag. 11/16 0x7502 U_WORD THD I3 1/10 % 0x7503 U_WORD THD V1 (V12) 1/10 % 0x7504 U_WORD THD V2 (V23) 1/10 % 0x7505 U_WORD THD V3 (V31) 1/10 % (1) RFU : Reserved for future users (2) W, var, VA / 100 if KTA*KTV < 5000 W, var, VA if KTA*KTV >= 5000 (3) Transformer ratio Measurement unit Display Format Protocol Format 1 KTA*KTV < 10 Wh(varh) * 10 xxxxxx.yy k xxxxxxyy 10 KTA*KTV < 100 Wh(varh) * 100 xxxxxxx.y k xxxxxxxy 100 KTA*KTV < 1000 kwh(kvarh) xxxxxxxx k xxxxxxxx 1000 KTA*KTV < kwh(kvarh) * 10 xxxxxx.yy M xxxxxxyy KTA*KTV < kwh(kvarh) * 100 xxxxxxx.y M xxxxxxxy KTA*KTV kwh(kvarh) * 100 xxxxxxxx M xxxxxxxx (4) : positive 1 : negative (5) wrap around means : when the main register of the energy value increases over , the register is then reset to 0 and the wrap around value is Incremented by 1.

12 COMMUNICATION MODBUS PROTOCOL Pag. 12/ SETUP PARAMETERS NEMO D4e parameters may be red and written accordingly to the procedure described in the following. The variable table to read and write the parameters are located at the same address. It is allowed to write the setup parameters addressed at 0x2000 and 0x2200 only by a single telegram for each group. Standard Setup parameters (read and write) Length : 16 BYTES 0x2000 U_WORD RFU 0x2001 U_WORD RFU 0x2002 U_WORD RFU 0x2003 U_WORD RFU 0x2004 U_WORD Percentage of rated 3phase active power run hour meter means (0.5% %) 0x2005 U_WORD Run hour meter active on 0:V1 1:P 0x2006 U_WORD RFU 0x2007 U_WORD RFU 0x2008 U_WORD RFU 0x2009 U_WORD RFU 0x200a U_WORD Power Averaging time 0:5min 1:8min 2:10min 3:15min 4:20min 5:30min 6:60min 0x200b U_WORD Insertion type 0:3n-3e 1: 3-3e 2: 3-2e 3:1n-1e 0x200c U_WORD Measure on line 3 of custom page 0:V1 1:V12 2:I1 3:In 4:P 5:Q 6:S 7:P1 8:Q1 9:S1 10:PF 3-phase

13 COMMUNICATION MODBUS PROTOCOL Pag. 13/16 0x200d U_WORD Measure on line 2 of custom page 0:V2 1:V23 2:I2 3:P 4:Q 5:S 6:P2 7:Q2 8:S2 9:Freq 10:I1 0x200e U_WORD Measure on line 1 of custom page 0:V3 1:V31 2:I3 3:P 4:Q 5:S 6:P3 7:Q3 8:S3 9:P1 10:I1 0x200f U_WORD RFU -

14 COMMUNICATION MODBUS PROTOCOL Pag. 14/16 Output option Setup parameters (read and write) Length : 24 BYTES 0x2200 U_WORD RFU 0x2201 U_WORD RFU 0x2202 U_WORD RFU 0x2203 U_WORD RFU 0x2204 U_WORD RFU 0x2205 U_WORD RFU 0x2206 U_WORD RFU 0x2207 U_WORD RFU 0x2208 U_WORD RFU 0x2209 U_WORD RFU 0x220a U_WORD RFU 0x220b U_WORD Pulse duration 0: 50msec 1: 100msec 2: 200msec 3: 300msec 0x200c U_WORD Pulse weight 0: 0.01 kwh 1: 0.10 kwh 2: 1.00 kwh 3:10.0 kwh 4: 0.10 MWh 5: 1.00 MWh 6:10.0 MWh 0x200d U_WORD Pulse on 0:Act Energy 1:Rea Energy 0x220e U_WORD RFU 0x220f U_WORD RFU 0x2210 U_WORD RFU 0x2211 U_WORD RFU 0x2212 U_WORD RFU 0x2213 U_WORD RFU 0x2213 U_WORD RFU 0x2214 U_WORD RFU - 0x2215 U_WORD RFU 0x2216 U_WORD RFU 0x2217 U_WORD RFU E.g. Request FF A 66 Answer : 0x2200 0x2201 0x2202 0x2203 0x2204 0x2205 0x2206 0x2207 0x2208 FF W0 W1 W2 W3 W4 W5 W6 W7 W8 0x2209 0x220a 0x220b 0x220c 0x220d 0x220e 0x220f 0x2210 0x2211 W9 W10 W11 W12 W13 W14 W15 W16 W17 0x2212 0x2213 0x2214 0x2215 0x2216 0x2217 W18 W19 W20 W21 W22 W23 CRC WORD FF D C1 W0.. W9 / W20 are not used.

15 COMMUNICATION MODBUS PROTOCOL Pag. 15/16 Procedure to write Every write operation must be preceded by a Master Unlock Key command. Address 0x2700 : write word with value = 0x5AA5 (Master Unlock Key) Reset of NEMO parameters Any writing operation of any parameter will have effect only in the volatile memory (RAM). After any writing operation of parameters described in the following of the document, if necessary to go back to the default it is mandatory to send the following commands : Address 0x2700 : write WORD with value = 0x 5AA5 ( Master Unlock Key ) Address 0x2800 : write WORD with value = 0x YYYY ( any value ) This command will reset the NEMO and in this way all changes will be lost so returning to the previous conditions. EEPROM savings If it is necessary to save the new parameters in EEPROM it is mandatory to send these following messages : Address 0x2700 : write WORD with value = 0x 5AA5 ( Master Unlock Key ) Address 0x2600 : write WORD with value = 0x YYYY ( any value )

16 COMMUNICATION MODBUS PROTOCOL Pag. 16/16 Write address table Address Format Description Value 0x100 U_WORD Current transformer ratio x U_WORD Standard setup parameters (10) 0x U_WORD Option setup parameters (10) 0x2400 U_WORD Reset Hour Meter, Maximum Powers, Maximum Voltages, (6) Maximum Currents, Minimum Voltages 0x2600 U_WORD Saving in EEPROM parameters changed by Remote commands (7) 0x2700 U_WORD Enable Remote Writing Operation (8) 0x2800 U_WORD Load previous setup parameters stored in EEPROM (9) (6) To reset desired measurements write the following word (in binary) : b8 b7 b6 b5 b4 b3 b2 b1 b0 b0 = 1 => Reset Hour Meter b1 = 1 => Reset Peak Maximum Demand b2 = 1 => Reset Maximum Voltage values b3 = 1 => Reset Maximum Current values b4.. b15 = 0 (7) Write any value to save the new parameters changed by Remote commands (8) To do any remote programming write operation, it s mandatory to write a safety key = 0x5AA5. (9) Write any value to abort any remote programming write operation and reload the previous values. (10) The parameters are read and written with the same sequence.

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